Rubber-cutting machine



Mar. 3. 1925. 1,528,445

- c: B. MARTIN RUBBER CUTTING MACHINE Filed July 17, 1922' 2 Sheets-Sheet 1 Mar 3, 1925." 1,528,446

0. B. MARTIN RUBBER CUTTING MACHINE Filed July 17, 1922 2 Sheets-v-Sheet :3

ing members (4).

pulley (11.)

Patented. Mon 3, 1925:.

TED TATE.

r11: 31K w RUBBERPCUTTING MACHINE.

Application filed July 17;

To all whom it may concern;

Be it known that I, GHARLEE? BACHMAN MARTIN, a citizen of the-United States, and a resident of Portland, county of Multnomall, State of Oregon, have'invented a new and useful Rubber-Cutting Machine, of which the following is a specification.

The present invention relates to improve ments .in'cutting machines for rubber or other flexible .material and has particular reference to a machine adapted to out the inner tube of a motor vehicle into rubber bands of any desired thickness. The princi pal object ot' the invention is to provide a machine of the character described/that will operate quickly and economically, that will teed automatically and cause the tube to alternately stop and advance so as to remain stationary during the cutting operation and to advance to a new position during the interval between two cutting opcrations. It is further proposed to use, for my device, a rotary cutter which allows of a large number of cutting operationsiu a very short time. It is further proposed to re ulate the stops and'the advances of the tube to correspond with the cutting opera tions. the invention tion proceeds,

The preferred form of the invention is shown in the accompanying drawing in which Figure 1 represents ,a top plan view of the same; Figure 2 an end elevation; Figure 3 a side elevation; Figure 4: an enlurged detail View illustrating the, mechanism for stopping and releasing t'he tire and Figure 5 an end elevation of the mechanism shown in Figure 4. While I have illustrated only the preferred form of my invention I wish to have it understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit'of the invention My device is shown as being supported on the frame (1) comprising preferably four upright members (2) joined at, the top by horizontal members (3) andlower bybrac- The main shaft (6) is journaled'in thebearing (7) secured to the frame and has the wheel or disc (9) sup ported thereon. Rotary motion is imparted to the shaft 6) and the wheel from the riving the shaft (12) and shaft (6) through the beveled will appear as the specificaactu'ating the shown The Further objects and advantages of supports blocks (22) resting on cushioning members (23) and slidable on pins (24) threadedly engaging one of the frame members (3) as at (26). The blade (21) bears against the guide. member 27) for the ner tube (28) which letter is advanced on its guide by means of two rolls (29) and upper one (29) of these rolls engaging the upper surface of the tube receives its rotary motion from the main shaft- (6) through the chains (31 and 32), the beveled gears (33) and (3 t) and the spur gears (38 and 39), the latter beingmounted on the shaft (37) supporting the upper roll.

he lower roll (30) which is mounted on the shaft (36) receives its motion from the shaft (37) through the cog wheels and (40). The speed at which the tube advances can of course be regulated to a nicety by the proper selection of gear ratios.

It is desired that, the tube remain stationary during the cutting operation and for this pirpose I introduce the clamping member (-ll) one end (42) of which is pivotally supported on the bracket (43) 'securedvto the guide'nicmbcr (27) as shown at (44:) while the other end (46) is normally forced downward by means of a spring l-7), the lower end of which is secured to the frame member (3) as shown at (48). The clamp inq member stretches across the path. of the tu e to be cut and when in its downward position prevents the forward end of the tube from advancing without interfering with the advance-of the intermediate portion of the tube engaged between two rolls. To release the tube and to allow the some to advance during the intervals between the cutting operations I provide a plurality of cams (49) on the main sh it (6) which engage the rounded head (51) of a bolt (52) secured in the clamping n'iember and lifts the latter during the time of the engagement whereby the tube is released temporarily.

The rubber hands cut oil from the tube are allowed to drop on the conveyor (53) supported on the drums (5-1) and actuated by the chain (56) passing over the sprocket wheel (57) on the shaft (36) and a sprodret tillill) messes (21} in ii scissor-hire cutting action. The tube restingon the guide member (2") is advanced steadily by the roilers {29 and 31) 7 the shaft through the chains and {32) but its forward end is alterped and released by the clamping it. ex n.) actuated by the cams (49) and the wing so that the tube is firmly held in its piece over the stationary blade with a short end protruding beyond the same during each cutting operation while it is allowed to advance between the cutting operationsx The pieces cut off during the ition of the machine fall on the conof the character described, side member, s blade resiliently sup- .'s 101." advancing an element to be cut toward the blade clamping niezins opcrat :he blade normally holding the Applying power front end of the element in fixed relation to the blade, a disc havin a blade thereon, means for rotating the disc so that its blade co-operates with the resiliently mounted blade in cutting the element While the same is chnnped, and cam means adapted to intermittently release the clamp and to permit the front end of the element to pass over the blade.

' 2. In 11. device of the character described means for intermittently holding and releasing an advancing element to be cut, comprising-a supporting member for the element, a transverse member 'pivotally supported on one side of the elementhaving spring means associated with its free end for normally clamping the element to its support ands rotating cam engaging the transverse member for intermittently releasing the element from the clam in action.

I}. The herein escribcd method of making riibber bands-Which consists in continuously feeding a soft rubber tube in one direction while successively flattening the succession with the process of flattening said tube to form rubber bands.

, CHARLES BACHMANMARTINL, Witnesses S, B. .BIARTIN, E. SWEENEY.

tube to bring its walls into Contact and of shearing he flattened tube trunsrurscly in 

